本例程实现了音频播放的基本功能，包括打开音频文件、播放、停止、暂停、快进、

快退和拖动进度条调整播放进度等。同时本例程还提供了基本的播放列表编辑功能，可以

实现音频文件的单个添加、通过选择目录进行批量添加、删除、调整播放列表的顺序以及

选择上一首或下一首进行播放等功能。-This routine implements the basic functions of audio playback, audio files, including open, play, stop, pause, fast forward, rewind and drag the progress bar to adjust the playback progress and so on. The routine also provides the same basic playlist editor function, can add a single audio file, batch by selecting the directory to add, delete, adjust the order of the playlist, and select the previous or next song for playback.